fix version-compare in calendars app.php

apps/calendar/appinfo/app.php

 <?php
-if(version_compare(PHP_VERSION, '5.3.0', '>')){
+if(version_compare(PHP_VERSION, '5.3.0', '>=')){
 	$l=new OC_L10N('calendar');
 	OC::$CLASSPATH['OC_Calendar_App'] = 'apps/calendar/lib/app.php';
 	OC::$CLASSPATH['OC_Calendar_Calendar'] = 'apps/calendar/lib/calendar.php';